What 𝕥 means
For lowercase 𝕥, the surrounding formula tells you what t stands for.
Blackboard bold grew from doubling selected strokes to make bold mathematical symbols stand apart on chalkboards. By 1965, mathematicians Robert Gunning and Hugo Rossi had included the style in a printed mathematics textbook.
Part of the collection
Don't confuse it with
3ｔ
Fullwidth Latin Small Letter T
Full-width Latin letter used in East Asian text; looks like the plain t with extra width, and differs for search and passwords.
𝑡
Mathematical Italic Small T
Italic math-alphabet copy of t. A styled copy that looks similar in most fonts but is a different character.
Circled Latin Small Letter T
Circled letter; an enclosed styled copy used for decoration, showing a t inside a ring.
Related characters
2
Questions people ask
1Why does 𝕥 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
More like this
11
How to type or find 𝕥
- Also called
- blackboard-bold t · double-struck t
- Search it as
- mathbb · blackboard-bold · double-struck · open-face
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
macOS
HTML
𝕥CSS
\1D565HTML
Write
𝕥 in HTML source; the browser displays 𝕥.LaTeX
AMSFonts 2.2d's
\mathbb alphabet has uppercase letters only; use a math font with lowercase double-struck letters for 𝕥.Text normalization
NFKC compatibility normalization maps 𝕥 to plain t, removing the mathematical styling.
Codes and encoding1 code points
HTML decimal
𝕥
HTML hex
𝕥
CSS content
content: "\1D565";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%F0%9D%95%A5
1
On screen
1
Code points
2
JS .length
4
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.